Fluid-translating device



June 5, 1923. 1,457,799

H. F. SCHMIDT FLUID TRANSLATING DEVICE Filed Dec. 31, 1920 HenryFScbM/UZ" INVENTOR.

' ATTORNEY Patented June 5, 1923.

UNITED STATES PATENT HENRY r. scn mn'r, or swARTHmonn-rENNsYLvANIA, ASSIGNOR 'r'o' WES-TING; HOUSE ELECTRIC Ann mauornc'roume COMPANY, A CORPORATION or PENN- SYLVANIA.

" FLUID-TRANSLATING IDEVICE.

Applicationfiled December 31, 1920. Serial No. 434,356.

To all mama may concern: 7

Be it known .thatlI, HENRY F. SCHMIDT, a citizen of'the United States, and a resident of Swarthmore, in the county of Delaware and State of Pennsylvahia, have invented a new I and useful Improvement in Fluid- Translating Devices, of which the followinglis a specification.

y invention relates to, fluid ejecting de- 10 vices, particularly of therVenturi tube type and it has for its objectto provide apparatusof the character designated which shall be simple in construction-and.effective in operation, "particularly in that-means, are provided for preventing thefluid-s passing the overflow port of; the ejector duringnor mal 1' operation :frombeing subjected t to the low. premure existing in the vessel. with which the overflow port is connected. ,c -Thesingle figure of the accompanying drawing is a diagrammatic sectional view of, an {ejecting device embodying my invention? 7 The overflow port-ofan ejector-is ordinarily connected to the vessel which the ejectorZeva-cuates, Tor tot someojther region of low-pressure-soithat (when the ejector overflows; the resistance to 1 the .110 w "of; fluids is as'low as possible,- Theulow. resistance to the flow of the fluids enablesthe jeton jets of .motive fluid; hereinafter called steam, to quickly accelerate the fluids to l a velocity suflicient to cause .them to pass theoverflow port and to be dischargedthrough the'diffuserj of'the ejector in the usual manner. In wcertaintypesgof ejectors the low pres sure, existingat' the :overflow port causes a certain amount of spilling and/evaporation of the fluids passing the port during normal operatiom I have found that it is desirable to have this port closed: when there is no tendency to overflow -:andyet to have it free to w open ash-soon as the tendencyr to overflow does occur. invention contemplatesa new 'and improved ejector in which the overflowopening is held closed duringxnormal operation of the ejector and yet is free to-open as soonas, the tendency to overflowoccurs. '1, 3

In-thedrawing} show an ejector-having -a-' nozzle *5," a :convergingcombining tube 6, andiadiverging. diffuser 7 axially? aligned and spaced-a in the usual manner.; As illustrated, the" nozzle-5 extends intoan inlet chamber 8; to which the fluidsto bei translated are delivered thru: an inlet i-pOIt' ,8,'.. The inletchamber 8 communicates" directly with the large or inlet endjoffthe combining tube 6 and may be consideredba's an .extension thereof. 3 i a I i The overflow ejector illustrated consists of a movable 'Wall 9 form; mg a part. of the wall-gottheflcombining tube 6, and hinged to theljc'ombiningtube at onerend by means, ofa" suitable hinge 10. Th s movable wall; 9- is therefore free to. swmg away from the combining, 1; tube 6'.

about the hinge l0 and; to thereby allow. the

fluids to overflow into. an overflow chamber l1.- As-illustrated, the. overflow chambenl'l is formed within a casing 12, which surroundsthe major part .of the, ejector and in which anoverflow; port 13 islprovided f The port 13 is" preferably connected, With the vessel which the ,ejector evacuates, so; that the pressure existing in theoverflow chamber 11 may. beras low Iaspossible. c

against'the combining tube 6,. or insurer words, in'its closed position, by vmean gffa piston 14, which .operates in. a cylinder-5 15 and t is provided, as illustrated, with stem or projection'ltiv bearing againstjthe mo' v-' able wall I have shown. the cy inder,,lf5 as mounted on the casing-'12 by an arm 17,

and as connected withthe largejend of ,the'

diverging difl'user, 7 by means ofja "cone duit18. e. c

In operation the steam discharged by, the nozzle 5 entrains the fluids 'to b e translated in the inlet chamberS andfcarr iesthem into the" combiningtubenfi in a manner well known to those' skilled inTtheart."v During ioverflow chamber 11. It will,-},of 'course,".be

understood that-the pressure in the overflow chamber 11 is ordinarily,relative'ly low .for 4 a der these conditions the resistance to flow is relatively low and consequently the fluids are quickly accelerated to a velocity sufficient to cause them to pass through the diffuser 7 against the discharge pressure. As soon as this occurs the pressure at the outlet of the diffuser 7 increases and consequently the, pressure on the piston 14 builds up and the movable wall 9 is moved to its closed position. The apparatus is preferably so proportioned that during normal operation theforce exerted by the pis-' ton 14 is sufficient to hold the movable wall 9 tightly closed.

It is evident that the loading of the overflow device, or in other words the force tending to hold the overflow wall 9 closed, varies.

with variations in pressure ofthe fluids pas ing through the ejector. It is also evident that during normal operation the fluids passing through the ejector are not subjected to the low pressure existing. in the overflow chamber of the ejector, and that if a tendency to overflow does occur the loading of the overflow device is soreduced that the fluids may overflow with little or no resistance to flow.

' While I have shown my invention in but one form, it will be obvious to those skilled in the art that it is not so limited, but is susceptible of various other changes and modifications, without departing from the spirit thereof, and'I desire. therefore. that only such limitations shall'be placed thereupon as are imposed by the prior art or as are specifically set forth in the appended claims.

What I claim is:

1. An ejector comprising an'inlet chamber, means for admitting fluid to be entrained to said chamber, a nozzle discharging a'jet of motive fluid intosaid chamber, a convergent-divergent tubular member communieating with said inlet chamber and disposed to receive said jet of motive fluid and fluids entrained thereby, an overflow port in said tubular member, a valve member closing said port, and means responsive to the pressure of fluids at the outlet of saidtubular member for holding the valve closed during the normal operation of the ejector, whereby said tubular member constitutes a fluid-tight passage for the fluids during normal operation of the ejector 2. An ejector comprising an inlet chamber, means for admitting fluid to be entrained to said chamber, a nozzle discharging a jet ofmotive fluid into'said chamber, a convergent-divergent tubular member conimunicating with said inlet chamber and disposed to receive said jet of motive fluid and fluids entrained thereby, an overflow port in said tubular member, a valve member closing said port, and means responsive to the pressure of fluids at the outlet of said tubular member for holding the valve closed during the normal operation of the ejector, com prising a cylinder, a piston in said cylinder, a rod secured to the piston and engaging the valve, and a conduit connecting the cylinder with the discharge portion of said tubular member, whereby said tubular member constitutes a fluid-tight passage for the fluids during normal operationof the ejector.

3. An ejector comprising an inlet chamber,

means for admitting fluid to be entrained'to I said chamber, a nozzle discharging a jet of motive fluid into said chamber, a convergentdivergent tubular member communicating with said inlet chamber and disposed to receive said jet of motive fluid and fluids entrained thereby, an overflow port in said tubular member, a valve member closing said port. an overflow chamber into which said overflow port opens, and means responsive to the pressure of fluids at the outlet of said tubular member for'holding the valve closed during the normal operation of the ejector, whereby said tubular member constitutes a fluid-tight passage for the fluids during normal operation of the ejector.

4. An ejector comprising an inlet chamber, means for admitting fluid to be entrained to said chamber, a nozzle discharging a jet of motive fluid into said chamber, a convergentdivergent tubular member communicating with said inlet chamber and disposed to receive said jet of motive fluid and fluids entrained thereby, an overflow port in said tubular member, a valve member closing said port, an overflow chamber into which said overflow port opens, a cylinder secured to a wall of said overflow chamber, a piston in said cylinder, a rod secured to the piston and engaging the valve, and-a conduit connecting the cylinder with the discharge portion of said tubular member, whereby the pressure of the fluids in the discharge portion of the tubular member 'acts to hold the valve in closed position to provide a fluid-tight passage for the fluids through the tubular memher during normal operation of the ejector.

5. An ejector comprising an inlet chamber, means for admitting fluid to be entrained to said chamber, a nozzle discharging a jet of motive fluid into said chamber, a convergentdivergent tubular member communicating with said-inlet chamber and disposed to receive said jet of motive fluid and fluids entrained thereby, an overflow port in said tubular member, a valve member closing said port, an overflow chambefinto which said overflow port opens, a cylinder within the overflow chamber and secured to a wall thereof, a conduit connecting the cylinder with the discharge portion of said tubular member, a piston in said cylinder subjectedon one side to the pressure of the discharge portions of said tubular member and on the other side to the pressure of fluids within her, 1920.

the Overflow chamber, a rod secured to 7 piston and engaging thevalve; whereby said tubular member constitutes va fluid-tight pas sage for the fluids'duringnormal operation of the ejector. r v In testimony whereof, I have hereunto subscribed my name this 28th day o f D z HENRY RS'CH IDTJ v 

